
■ Unit : mm major diameter of external threads bar diameter Size
d max d min dmax dmin (ref.)
P dmax dmin T dmax dmin T No.0-80UNF 1.511 1.431 1.45
d d 1/16 SM 80 1.588 1.518 1.54
| 4.5 | 41.937 | 41.437 | 0.500 | 41.930 | 41.610 | 0.320 | No.1-64UNC | 1.838 | 1.743 | 1.77 | ||||||
| 4 | 41.940 | 41.465 | 0.475 | 41.940 | 41.465 | 0.475 | No.1-72UNF | 1.838 | 1.751 | 1.77 | 5/ 64 SM 64 | 1.984 | 1.904 | 1.92 | ||
| M42 | 3 | 41.952 | 41.577 | 0.375 | 41.952 | 41.577 | 0.375 | No.2-56UNC | 2.169 | 2.066 | 2.09 | 3/32 SM 56 | 2.381 | 2.286 | 2.31 | |
| 2 | 41.962 | 41.682 | 0.280 | 41.940 | 41.640 | 0.300 | No.2-64UNF | 2.169 | 2.073 | 2.10 | SM 100 | 2.381 | 2.306 | 2.32 |
3/32
| 1.5 | 41.968 | 41.732 | 0.236 | 41.950 | 41.780 | 0.170 | No.3-48UNC | 2.496 | 2.383 | 2.41 | |||||
| 4.5 | 44.937 | 44.437 | 0.500 | 44.930 | 44.610 | 0.320 | No.3-56UNF | 2.496 | 2.393 | 2.42 | 1/8 SM 40 | 3.175 | 3.045 | 3.08 | |
| 4 | 44.940 | 44.465 | 0.475 | 44.940 | 44.465 | 0.475 | No.4-40UNC | 2.824 | 2.695 | 2.73 | 1/8 SM 44 | 3.175 | 3.055 | 3.09 | |
| M45 | 3 | 44.952 | 44.577 | 0.375 | 44.952 | 44.577 | 0.375 | No.4-48UNF | 2.827 | 2.713 | 2.74 | 3.442 | 3.47 |
9/ 64 SM 40 3.572
| 2 | 44.962 | 44.682 | 0.280 | 44.940 | 44.640 | 0.300 | No.5-40UNC | 3.154 | 3.026 | 3.06 | |||||
| 1.5 | 44.968 | 44.732 | 0.236 | 44.950 | 44.780 | 0.170 | No.5-44UNF | 3.157 | 3.036 | 3.07 | 11/ 64 SM 40 | 4.366 | 4.236 | 4.27 | |
| 5 | 47.929 | 47.399 | 0.530 | 47.930 | 47.590 | 0.340 | No.6-32UNC | 3.484 | 3.333 | 3.37 | 3/ | SM 24 | 4.762 | 4.602 | 4.64 |
16
4 47.940 47.465 0.475 47.940 47.465 0.475 No.6-40UNF 3.484 3.356 3.39
3/16 SM 28 4.762 4.602 4.64
| M48 | 3 | 47.952 | 47.577 | 0.375 | 47.952 | 47.577 | 0.375 | No.8-32UNC | 4.142 | 3.991 | 4.03 | |||||
| 2 | 47.962 | 47.682 | 0.280 | 47.940 | 47.640 | 0.300 | No.8-36UNF | 4.145 | 4.006 | 4.04 | 3/16 SM 32 | 4.762 | 4.602 | 4.64 | ||
| 1.5 | 47.968 | 47.732 | 0.236 | 47.950 | 47.780 | 0.170 | No.10-24UNC | 4.800 | 4.618 | 4.66 | 7/ | SM 32 | 5.556 | 5.396 | 5.44 |
32
No.10-32UNF 4.803 4.651 4.69
15/ 64 SM 28 5.953 5.773 5.82
| No.12-24UNC | 5.461 | 5.279 | 5.32 | |||||
| No.12-28UNF | 5.461 | 5.296 | 5.34 | 1/4 SM 24 | 6.350 | 6.170 | 6.22 | |
| 1/4-20UNC | 6.322 | 6.117 | 6.17 | 1/ | SM 40 | 6.350 | 6.220 | 6.25 |
4
1/4-28UNF 6.324 6.160 6.20
・from table 2 JIS B 0226 (void in 2001)
| 5/16-18UNC | 7.907 | 7.687 | 7.74 | ||||
| 5/16-24UNF | 7.909 | 7.727 | 7.77 | ||||
| 3/8-16UNC | 9.491 | 9.254 | 9.31 | ||||
| 3/8-24UNF | 9.497 | 9.315 | 9.36 | ■ | ■ | ||
| 7/16-14UNC | 11.076 | 10.816 | 10.88 | Taper pipe threads (PT, R) | Parallel pipe threads (PF · G)(for A class) |
Unit : mm Unit : mm
7/16-20UNF 11.079 10.874 10.93
bar diameter (ref.) major diameter of external threads bar diameter
1/2-13UNC 12.611 12.386 12.4 Size Size
dmax dmin (ref.)
1/2-20UNF 12.666 12.462 12.5 taper (dia of thread end) Straight
PT 1/16 - 28 7.5 7.9 PF 1/16 - 28 7.723 7.509 7.56
9/16-12UNC 14.246 13.958 14.0
| 9/16-18UNF | 14.251 | 14.031 | 14.1 | PT | 1/ 8 - 28 | 9.5 | 9.9 | PF | 1/8 - 28 | 9.728 | 9.514 | 9.57 | ||
| 5/8-11UNC | 15.834 | 15.528 | 15.6 | PT | 1/ | - 19 | 12.8 | 13.4 | PF | 1/ | - 19 | 13.157 | 12.907 | 13.0 |
4 4
5/8-18UNF 15.839 15.619 15.7
| 3/4-10UNC | 19.004 | 18.677 | 18.8 | PT | 3/ 8 - 19 | 16.3 | 16.9 | PF | 3/8 - 19 | 16.662 | 16.412 | 16.5 | ||
| 3/4-16UNF | 19.011 | 18.774 | 18.8 | PT | 1/2 - 14 | 20.5 | 21.3 | PF | 1/2 - 14 | 20.955 | 20.671 | 20.7 | ||
| 7/8-9UNC | 22.176 | 21.824 | 21.9 | PT | 3/ | - 14 | 25.9 | 26.8 | PF | 5/ | - 14 | 22.911 | 22.627 | 22.7 |
4 8
7/8-14UNF 22.184 21.923 22.0
25.349 24.969 25.1 PT 1 - 11 32.7 33.7 PF 3/4 - 14 26.441 26.157 26.2
1-8UNC
| 1-12UNF | 25.354 | 25.065 | 25.1 | PT 1 1/4 - 11 | 41.2 | 42.3 | PF | 7/8 - 14 | 30.201 | 29.917 | 30.0 | |
| 1 1/8-7UNC | 28.519 | 28.103 | 28.2 | PT 1 1/ | - 11 | 47.1 | 48.2 | PF | 1 - 11 | 33.249 | 32.889 | 33.0 |
2
1 1/8-12UNF 28.529 28.240 28.3
| 1 1/4-7UNC | 31.694 | 31.278 | 31.4 | PT | 2 - 11 | 58.7 | 60.1 | PF 1 1/8 - 11 | 37.897 | 37.537 | 37.6 | |
| 1 1/4-12UNF | 31.704 | 31.415 | 31.5 | PF 1 1/4 - 11 | 41.910 | 41.550 | 41.6 | |||||
| 1 3/8-6UNC | 34.864 | 34.402 | 34.5 | PF 1 1/ | - 11 | 47.803 | 47.443 | 47.5 |
2
| 1 3/8-12UNF | 34.876 | 34.588 | 34.7 | |||||
| 1 1/2-6UNC | 38.039 | 37.577 | 37.7 | PF | 2 - 11 | 59.614 | 59.254 | 59.3 |
| 1 1/2-12UNF | 38.051 | 37.763 | 37.8 | |||||
| 1 3/4-5UNC | 44.381 | 43.861 | 44.0 | |||||
| 2-4.5UNC | 50.726 | 50.168 | 50.3 |